Home / 1,688.85-2,529.92-1,321.92

Finding the Fourth Proportional to 1,688.85, 2,529.92 and 1,321.92

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Solution

The fourth proportional to 1,688.85, 2,529.92 and 1,321.92 is: 1,980.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,688.85 : 2,529.92 = 1,321.92 : x
  2. Step 2: Convert to fraction form
    1,688.85/2,529.92 = 1,321.92/x
  3. Step 3: Cross multiply
    1,688.85x = 2,529.92 × 1,321.92
  4. Step 4: Simplify right side
    1,688.85x = 3,344,347.72
  5. Step 5: Solve for x
    x = 3,344,347.72/1,688.85
  6. Step 6: Final answer
    x = 1,980.25

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.